Opening roller housing for an opening roller of an open-end spinning device and open-end spinning device with an opening roller housing

ABSTRACT

An opening roller housing ( 1 ) for an opening roller ( 2 ) of an open-end spinning machine ( 3 ) has a feed opening ( 4 ) for feeding a fiber material ( 5 ) into the opening roller housing ( 1 ), a delivery opening ( 6 ) for drawing opened individual fibers ( 7 ) out of the opening roller housing ( 1 ), a trash removal opening ( 8 ) for extracting trash ( 9 ) out of the fiber material ( 5 ), and an inner circumferential wall ( 10 ), which surrounds the opening roller ( 2 ) during operation and has a fiber-guiding area ( 11 ), which extends from the feed opening ( 4 ), over the trash removal opening ( 8 ), and up to the delivery opening ( 6 ). The opening roller housing ( 1 ) includes a hollow cylindrical ring ( 12 ). The hollow cylindrical ring ( 12 ) is designed as a self-supporting component, which is directly fastenable on a carrier part ( 13 ) of the open-end spinning machine ( 3 ) and includes the inner circumferential wall ( 10 ) having the fiber-guiding area ( 11 ) as well as the feed opening ( 4 ), the delivery opening ( 6 ), and the trash removal opening ( 8 ). An open-end spinning machine ( 3 ) includes an opening roller housing ( 1 ) of this type.

The present invention relates to an opening roller housing for anopening roller of an open-end spinning machine, having a feed openingfor feeding a fiber material into the opening roller housing, having adelivery opening for drawing opened individual fibers out of the openingroller housing, having a trash removal opening for extracting trash outof the fiber material, and having an inner circumferential wall, whichsurrounds the opening roller during operation and has a fiber-guidingarea, which extends from the feed opening, over the trash removalopening, and up to the delivery opening, wherein the opening rollerhousing includes a hollow cylindrical ring.

Opening roller housings have become known in various embodiments fromthe prior art and are utilized on open-end spinning machines in order toopen a strip-shaped fiber material fed to the opening device intoindividual fibers and to then feed the opened individual fibers to thespinning device.

For example, an opening roller housing is known from DE 32 07 575 C2,which is manufactured as a cast part, for example, in an injectionmolding process or a die casting process. The housing is therefore madeof a relatively soft material. An insert is therefore provided in theinterior space of the housing in order to protect the housing wallsurfaces and improve the extraction of trash. The insert is composed ofthin metal sheet and is designed in the shape of a cup such that it alsoforms a back wall of the opening roller housing. As a result, the inserthas nearly no edges at which fibers could cling, and so the risk offiber fly being generated in the opening roller housing is reduced. Theinsert is also easily replaceable.

EP 1 462 550 A1 describes another embodiment of an opening rollerhousing having a replaceable insert. There, the insert is arranged inthe area after the feed opening and extends up to the area of the trashremoval opening. The insert forms the peripheral wall of the openingroller housing at least partially, although at least in the area of thetrash removal opening. As a result, the opening roller housing can beeasily adapted to various fiber materials and spinning conditions. Thesize as well as the position of the trash removal opening can bemodified as a result. There is a risk, however, at the transition of theinsert to the rest of the opening roller housing that fibers can clingand accumulate there. In addition, various inserts must be kept on handand installed.

EP 3 620 558 A1 also describes an opening roller housing having areplaceable insert. The insert is designed as a hollow cylindrical ring,which has a trough-shaped fiber infeed into the delivery opening and awall area having an opening for adjusting the trash removal opening.Moreover, with respect to this insert, due to the thickness of itscylindrical wall, it is to be possible to adjust the annular gap betweenthe opening roller housing and the opening roller. The adjustment ofthese parameters is carried out by replacing the insert, and so variousinserts must be kept on hand and installed in this case as well.

The problem addressed by the present invention is therefore that ofproviding an opening roller housing, which is easily manufacturable andinstallable and, in addition, avoids the generation of fiber fly in theopening roller housing.

The problem is solved by an opening roller housing and an open-endspinning machine having the features of the independent patent claims.

An opening roller housing for an opening roller of an open-end spinningmachine has a feed opening for feeding a fiber material into the openingroller housing, a delivery opening for drawing opened individual fibersout of the opening roller housing, a trash removal opening forextracting trash out of the fiber material, and an inner circumferentialwall, which surrounds the opening roller during operation and has afiber-guiding area, which extends from the feed opening, over the trashremoval opening, and up to the delivery opening. The opening rollerhousing includes a hollow cylindrical ring.

It is provided that the hollow cylindrical ring is designed as aself-supporting component, which is directly fastenable on a carrierpart of the open-end spinning machine and includes the innercircumferential wall having the fiber-guiding area as well as the feedopening, the delivery opening, and the trash removal opening.

In contrast to the prior art, the provided opening roller housingtherefore no longer has an additional insert. In order to carry out anadaptation to various fiber materials or various spinning conditions, itis therefore necessary to replace the entire opening roller housing.Since, however, the ring-shaped opening roller housing forms the basicbody of the opening roller housing and is directly fastenable on thecarrier part, this can be easily and quickly effectuated. Since, inaddition, the ring-shaped opening roller housing is reduced to theessential functions, namely the provision of the aforementioned openingsas well as the fiber-guiding area, and has a highly compact shape, theopening roller housing can nevertheless be cost-effectivelymanufactured. Since the ring-shaped opening roller housing is designedas one piece, in addition, no gaps are present, at which fibers couldcling. The tendency for fiber fly to be generated in the opening rollerhousing is therefore reduced.

It is particularly advantageous when the ring has fastening bores, inparticular threads, for its fastening on the carrier part of theopen-end spinning machine.

It is particularly advantageous when the ring has fastening bores, inparticular threads, for its fastening on the carrier part of theopen-end spinning machine. As a result, the opening roller housing canbe easily fastened on the carrier by screwing. High drive forces can begenerated due to the screwing, and so the opening roller housing can befastened on the carrier part in a nearly gap-free manner. The tendencyfor fiber fly to be generated is further reduced as a result.

The fastening bores can be designed as through-bores, and so the openingroller housing can be installed from the front side of the spinningdevice.

According to another embodiment, it can also be advantageous, however,when the fastening bores are designed as blind bores and, in particular,as threads. In this case, the fastening can be carried out from a backside of the carrier part of the open-end spinning machine. This isadvantageous, for example, for the case in which the carrier part is apivoting housing that is foldable downward away from the open-endspinning machine.

It is also advantageous when the fastening bores are arranged on an endface of the ring. As a result, the shape of the ring can also be kepthighly compact, since no additional fastening tabs are necessary. Thegap-free fastening of the opening roller housing on the carrier part canbe even further supported as a result.

It is advantageous when the opening roller housing also includes aplastic cover surrounding the ring. The plastic cover establishes, onthe one hand, a visually attractive transition to the carrier part ofthe open-end spinning machine. On the other hand, the plastic cover canbe utilized for the integration and/or the covering of furthercomponents such as, for example, a fiber channel insert.

It is also advantageous when the fastening bores are arranged on an endface of the ring. As a result, the shape of the ring can also be kepthighly compact, since no additional fastening tabs are necessary. Thegap-free fastening of the opening roller housing on the carrier part canbe even further supported as a result.

It is advantageous when the opening roller housing also includes aplastic cover surrounding the ring. The plastic cover establishes, onthe one hand, a visually attractive transition to the carrier part ofthe open-end spinning machine. On the other hand, the plastic cover canbe utilized for the integration and/or the covering of furthercomponents such as, for example, a fiber channel insert.

It is also advantageous when the plastic cover is integrally joined withthe ring, in particular being injected directly onto the hollowcylindrical ring. As a result, the opening roller housing is alsodesigned as one piece when different materials are used for the hollowcylindrical ring and the plastic cover. The opening roller housing isclosed in a gap-free manner by the plastic cover, and so the risk offibers clinging to gaps is even further reduced. The integral connectioncan be established, in particular, by injecting the plastic coverdirectly onto the hollow cylindrical ring. It is also conceivable,however, to weld the two parts to each other, for example, viaultrasonic welding. A bonding is also conceivable.

It is advantageous when the ring includes one or multiple form-lockingelement(s) for the form-locking connection with the plastic cover,wherein preferably the form-locking element(s) is/are arranged on anouter circumferential wall of the ring. These types of form-lockingelements can also be advantageous in an integral connection as describedabove. By means of the form-locking elements, a form-locked connectionis additionally established between the hollow cylindrical ring and theplastic cover. As a result, the plastic cover is particularly well fixedto the hollow cylindrical ring. If the form-locking elements are mountedon the outer circumferential wall of the ring, these are located outsideof functional surfaces or functional areas. It is also conceivable,however, to mount form-locking elements, in particular, on the front endface of the ring, i.e., the end face of the ring facing outward in theinstalled state of the opening roller housing.

According to another embodiment, it is advantageous when the plasticcover includes one or multiple clip element(s) for connection with thering. In this case, the plastic ring is detachably connected with thering. The clip elements latch into a latching shoulder of the ringshaped correspondingly to the clip elements. Depending on the type ofmanufacturing of the ring and of the plastic cover, this embodiment canoffer advantages. In this case as well, however, the hollow cylindricalring forms the basic body of the opening roller housing, which supportsthe plastic cover. The advantages of the simple fastening are thereforealso achieved with this embodiment.

Moreover, it is advantageous when the ring is made of a metallicmaterial, in particular a steel or aluminum material, and is preferablydesigned as a cast part.

Due to the design made of a steel or aluminum material, the hollowcylindrical ring can be designed to be stable and wear-resistant and,therefore, can also directly form the fiber-guiding surfaces of theopening roller housing. Due to the design as a cast part, shapes thatare not completely round, shapes having extensions, and the integrationof further functions are also possible.

It is also advantageous when the hollow cylindrical ring is machined. Aring designed as a cast part can also be reworked easily and preciselyvia machining. In particular, the fiber-guiding surfaces as well as, ifnecessary, air-guiding surfaces can be manufactured with a high surfacequality and a high accuracy as a result.

It is also advantageous when the inner circumferential wall of the ringis provided, at least in the fiber-guiding area, with a coating, inparticular a wear-resistant coating. The service life of the openingroller housing can be improved as a result. In addition, the surfacequality as well as flow properties and fiber-routing properties of thering can be improved with a coating.

It is particularly advantageous when the ring also includes a bypassopening for feeding a supply air flow into the opening roller housing.The bypass opening is utilized for supplying additional air to theopening roller housing, and so less air needs to be drawn in via thetrash removal opening. As a result, the extraction of trash can beimproved in a known way.

It is advantageous when the ring has a radially outward pointingextension, which includes the bypass opening. Therefore, all functionscan be integrated in a single, stable component.

It is particularly advantageous when the extension is formed as onepiece with the ring. The extension can be formed as one piece with thering, for example, as a cast part. Due to the one-piece design of thebypass opening with the hollow cylindrical ring, the bypass is alsodesigned without seams. As a result, the tendency for fiber fly to begenerated in the bypass is also reduced. Alternatively, it is alsopossible, however, that the extension is an additional part, which isattached to the ring.

Moreover, it is advantageous when the ring includes a receiving openingfor a fiber channel insert in the area of the delivery opening. Thefiber channel insert guides, in a manner known, per se, the openedindividual fibers from the opening roller housing to the rotor housingof the spinning device. Due to the fact that the receiving opening isprovided directly in the ring, the fiber channel insert is alwaysaccommodated geometrically precisely in the opening roller housing.

The aforementioned advantages, in particular the cost advantages, thesimplified installation, and the reduced tendency for fiber fly to begenerated are also achieved on an open spinning device having an openingroller housing of this type, and so protection is also claimed therefor.

Further advantages of the invention are described in the followingexemplary embodiments, wherein:

FIG. 1 shows a workstation of an open-end spinning machine in aschematic, partially cutaway side view,

FIG. 2 shows a detailed representation of an open-end spinning machinein a schematic, cutaway side view,

FIG. 3 shows a schematic, partially cutaway front view of an open-endspinning machine with an opening roller housing,

FIG. 4 shows a schematic front view of an open-end spinning machine withan opening roller housing including a plastic cover,

FIG. 5 shows a detached sectional representation through the openingroller housing from FIG. 4 with the plastic cover,

FIG. 6 shows a detached sectional representation through the openingroller housing from FIG. 4 with the plastic cover in an alternativeembodiment,

FIG. 7 shows a schematic front view of an opening roller housingaccording to an alternative embodiment with an integrated bypassopening, and

FIG. 8 shows a schematic front view of an opening roller housing withaddressed form-locking elements.

In the following description of the exemplary embodiments, features thatare identical or at least comparable with respect to their design and/ormode of operation are provided with identical reference numbers.Moreover, these are explained in detail only at their first mention,while only the differences from the previously described exemplaryembodiments are discussed in the subsequent exemplary embodiments.Moreover, for the sake of clarity, often only one or only a few ofseveral identical components and/or features is/are labeled.

FIG. 1 shows a schematic, partially cutaway side view of a workstation29 of an open-end spinning machine. The workstation 29 includes, in away known, per se, an opening roller 2 arranged in an opening rollerhousing 1, to which a strip-shaped fiber material 5 is fed. In theopening roller housing 1, the fiber material 5 is opened by the openingroller 2 into individual fibers 7 and fed to an open-end spinningmachine 3. The open-end spinning machine 3 includes a spinning rotor 31arranged in a rotor housing 30 for spinning the fiber material and isacted upon by vacuum via a vacuum duct 36. The finished yarn 32 isfinally drawn off with a take-off device 33 and fed to a winding device34, where it is wound onto a bobbin 35. In the present case, the openingroller housing 1 is arranged on a carrier part 13, which is designed asa pivoting housing and simultaneously includes a cover element (notlabeled) for the rotor housing 30. The carrier part 13 or the pivotinghousing can be swiveled away in the direction of the arrow in order tofree the access to the rotor housing 30. The carrier part 13 is mountedon a machine frame 25 of the open-end spinning machine.

FIG. 2 now shows a detailed representation of an open-end spinningmachine 3 in a schematic, cutaway side view. The arrangement of thespinning rotor 31 in the rotor housing 30 as well as the mounting of thecarrier part 13 on the machine frame 25 are apparent again in detail. InFIG. 2 , the opening roller housing 1 as well as the opening roller 2are again more readily apparent. As is apparent from FIG. 2 , thecarrier part 13 includes a bearing point 22, in which the opening roller2 is accommodated. The opening roller housing 1 includes a hollowcylindrical ring 12, which is designed as a self-supporting componentand is mounted directly on the carrier part 13 of the open-end spinningmachine 3. In the present case, the ring 12 is mounted directly on itsend face 15 facing the carrier part 13. For this purpose, the ring 12 ismounted on the carrier part 13 by means of fasteners 26, for example,screws, represented here merely symbolically as a dash-dotted line. Thering 12 has an inner circumferential wall 10, which surrounds theopening roller 2 arranged in the opening roller housing 1 duringoperation. Moreover, the ring has an outer circumferential wall 18 andanother end face 15 facing away from the carrier part 13.

FIG. 3 shows a schematic, partially cutaway front view of an open-endspinning machine 3 with an opening roller housing 1. The function aswell as the various functional areas of the opening roller housing 1 arereadily apparent in this figure. The opening roller housing 1 includes,in a way known, per se, a feed opening 4, via which the fiber material 5(see FIG. 1 ) is conveyed into the opening roller housing 1 by means ofa feed roller 20 and fed to the opening roller 2. The fiber material 5is combed by the opening roller 2 (not represented here. Only thebearing point 22 is visible here) rotating in the direction of thearrow, opened, and transported further over the trash removal opening 8up to a delivery opening 6, at which the opened individual fibers 7 (seeFIG. 1 ) are drawn out of the opening roller housing 1 and fed to thespinning rotor 31. As already mentioned with respect to FIG. 1 , therotor housing 30 is acted upon by vacuum such that the individual fibers7 can be transported by means of an air flow from the delivery opening 6up to the spinning rotor 31. The air flow assists the transport offibers in the opening roller housing 2.

At the trash removal opening 8, trash 9 extracted from the fibermaterial 5 by the opening roller 2 is slung out of the opening rollerhousing 1 due to the centrifugal force and can be disposed of. Trashcontained in the fiber material 5 can therefore no longer enter into thespinning process and adversely affect the quality of the produced yarn32 (see FIG. 1 ). The trash removal opening 8 is connected tosurrounding air. The inner circumferential wall 10 of the ring 12 of theopening roller housing 1 therefore forms, at least partially directly, afiber-guiding area in the case of the present opening roller housing 1.The fiber-guiding area 11 is symbolized in the present case by a dottedline and extends from the feed opening 4 over the trash removal opening8 up to the delivery opening 6.

The described opening roller housing 1 includes the self-supporting ring12 as an essential component and, therefore, has a particularly simpleand compact shape. The ring 12 is preferably made of a metal material,for example, of steel or aluminum. As a result, it can becost-effectively manufactured and installed. As already described withrespect to FIG. 2 , the self-supporting ring 12 can be mounted directlyon the carrier part 13 of the open-end spinning machine 3 andsimultaneously includes all essential fiber-guiding surfaces in thefiber-guiding area 11. For the mounting on the carrier part 13, the ring12 can include, for example, fastening bores 14, as represented in FIGS.7 and 8 . Moreover, the feed opening 4, the delivery opening 6, and thetrash removal opening 8 are also arranged directly in theself-supporting ring 12. It is therefore not necessary to form theopening roller housing 1 from multiple parts or provide the openingroller housing 1 with an additional insert, as in the prior art. Thisalso contributes to a reduction of the assembly and manufacturing effortrelated to the opening roller housing 1. In addition, due to theone-piece design with the self-supporting ring 12, there are no gapsbetween various parts of the opening roller housing 1 at which fiberscould accumulate and cling.

FIG. 4 shows a schematic front view of an open-end spinning machine 3with an opening roller housing 1 including a plastic cover 16. Theplastic cover 16 surrounds the opening roller housing 1 and closes thistoward the outside, ensures a visually attractive appearance, and canalso be utilized for integrating further components or coveringfunctional components adjacent to the opening roller housing 1. Theplastic cover 16 shown here extends, for example, up to the rotorhousing 30 (not represented here) and creates an appealing transitionthereto. Moreover, it is apparent from FIG. 4 that the delivery opening6 with respect to the present opening roller housing 1 is designed as areceiving opening 24 for a fiber channel insert 27. These types of fiberchannel inserts 27 are known from the prior art and are typical fortransporting the opened individual fibers 7 to the spinning rotor 31.Due to the fact that the fiber channel insert 27 in the embodiment shownis accommodated directly in the receiving opening 24 of the ring 12, thefiber channel insert 27 is assigned to the opening roller housing 1 andthe opening roller 2 rotating therein in a geometrically particularlyprecise manner. The largest portion of the fiber channel insert 27 iscovered by the plastic cover 16. In this embodiment as well, the ring 12is made of a metal material such as steel or aluminum. The plastic cover16 can be injected directly onto the ring 12 in a particularlyadvantageous way. In this case, the plastic cover 16 is integrallyjoined with the ring 12. However, the plastic cover 16 could also beconnected to the ring 12, for example, via ultrasonic welding oradhesive bonding. In the case of an integral connection of this type, itis also advantageous, however, when the ring 12 additionally includesform-locking elements 17 for the form-locking connection with theplastic cover 16, as described in the following. In this case, theplastic cover 16 seals the opening roller housing 1 toward the outsidewithout gaps.

FIG. 5 shows a sectional representation along the lines of cut indicatedin FIG. 4 in a detached representation. In this sectional view, it isapparent that the ring 12 includes a form-locking element 17 in the areaof its outer circumferential wall 18 in this case. Moreover, the plasticcover 16 is readily apparent in this sectional view. According to afirst embodiment, it is possible that the plastic cover 16 is merelyslid onto the ring 12 and is pulled over the ring 12 only in the area ofthe form-locking element 17. For this purpose, the plastic cover 16 musthave a certain elasticity. In this case, the plastic cover 16 isfastened to the ring 12 exclusively by means of one or multipleform-locking element(s) 17. Multiple form-locking elements 17 can beprovided on the circumferential wall 18 as well as on the end face 15 ofthe ring 12 facing away from the carrier part 13.

A form-locking connection of this type is also advantageous, however, inparticular in addition to the integral connection already described withrespect to FIG. 4 in order to improve the durability of the connection.

FIG. 6 also shows a sectional representation along the lines of cutindicated in FIG. 4 in a detached representation, although this includesan alternative form of the connection between the ring 12 and theplastic cover 16. The plastic cover 16 in the present example includestwo clip elements 19 for connection with the ring 12. In this case, theplastic cover 16 is held on the ring 12 in a purely form-fitting manner.The clip elements 19 are arranged on the plastic cover 16 in anelastically resilient manner and, for this reason, do not obstruct theinstallation of the plastic cover 16 on the ring 12. In the installedstate, the clip elements 19 therefore each interact with a latchingshoulder 28, which is provided in the ring 12.

FIG. 7 now shows a first embodiment of a ring 12 of an opening rollerhousing 1 in a schematic front view. In contrast to the embodiment fromFIG. 3 , the presently shown opening roller housing 1 and the ring 12additionally include a bypass opening 21 for feeding a supply air flowinto the opening roller housing 1. By means of the bypass opening 21,the air supply through the trash removal opening 8 into the openingroller housing 1 is limited, and so the trash particles contained in thefiber material 5 to be opened can be better extracted. In particular,this also makes it possible to extract lighter-weight trash particles,which would otherwise be carried along with the air flow in the openingroller housing 1 and would remain in the fiber material 5.

The bypass opening 21 is arranged in an extension 23 of the ring 12. Thebypass opening 21 is therefore integrated into the opening rollerhousing 1 in an advantageous way. As is also apparent from FIG. 7 , thering 12 includes yet another extension 23, which delimits the trashremoval opening. Therefore, even more functions are combined in a singlecomponent in the present ring 12 and opening roller housing 1, whichsimplifies manufacturing as well as assembly. A ring 12 of this type canbe easily manufactured, for example, as a cast part, in particular as aninjection molded part. The surfaces in the fiber-guiding area 11 canalso be additionally machined in order to achieve a high surfacequality, and/or provided with a wear-resistant coating, whichincidentally also applies for all embodiments of the ring 12 shown inother figures.

Moreover, in the present example, a total of four fastening bores 14 areapparent in FIG. 7 for mounting the ring 12 on the carrier part 13 (seeFIG. 2 ). Preferably, these fastening bores 14 are designed as threads,and so the ring 12 can be screwed on directly on the carrier part 13 bymeans of multiple screws.

Due to the contact force of the screws, a seamless connection can alsobe formed here.

FIG. 8 now shows yet another schematic front view of one furtherembodiment of a ring 12, which includes an extension 23 having a bypassopening 21 as is also the case for the ring 12 from FIG. 7 . In contrastto FIG. 7 , form-locking elements 17 are shown on this ring, which arealso arranged in the area of an outer circumferential wall 18. Asalready described with respect to FIG. 5 , these can be provided inaddition to an integral connection with the plastic cover 16 in order togive the plastic cover 16 greater hold, or as the only means ofconnection to the plastic cover 16.

The present invention is not limited to the represented and describedexemplary embodiments. Modifications within the scope of the claims arealso possible, as is any combination of the described features, even ifthey are represented and described in different parts of the descriptionor the claims or in different exemplary embodiments, provided nocontradiction to the teaching of the independent claims results.

LIST OF REFERENCE NUMBERS

-   -   1 opening roller housing    -   2 opening roller    -   3 open-end spinning machine    -   4 feed opening    -   5 fiber material    -   6 delivery opening    -   7 individual fibers    -   8 trash removal opening    -   9 trash    -   10 inner circumferential wall    -   11 fiber-guiding area    -   12 ring    -   13 carrier part    -   14 fastening bore    -   15 end face    -   16 plastic cover    -   17 form-locking element    -   18 outer circumferential wall    -   19 clip element    -   20 feed roller    -   21 bypass opening    -   22 bearing point    -   23 extension    -   24 receiving opening    -   25 machine frame    -   26 fastener    -   27 fiber channel insert    -   28 latching shoulder    -   29 workstation    -   30 rotor housing    -   31 spinning rotor    -   32 yarn    -   33 take-off device    -   34 winding device    -   35 package    -   36 vacuum duct

1. An opening roller housing (1) for an opening roller (2) of anopen-end spinning machine (3), having a feed opening (4) for feeding afiber material (5) into the opening roller housing (1), having adelivery opening (6) for drawing opened individual fibers (7) out of theopening roller housing (1), having a trash removal opening (8) forextracting trash (9) out of the fiber material (5), and having an innercircumferential wall (10), which surrounds the opening roller (2) duringoperation and has a fiber-guiding area (11), which extends from the feedopening (4), over the trash removal opening (8), and up to the deliveryopening (6), wherein the opening roller housing (1) includes a hollowcylindrical ring (12), characterized in that the hollow cylindrical ring(12) is designed as a self-supporting component, which is directlyfastenable on a carrier part (13) of the open-end spinning machine (3)and includes the inner circumferential wall (10) having thefiber-guiding area (11) as well as the feed opening (4), the deliveryopening (6), and the trash removal opening (8). 2-14. (canceled)